What this error mean?

Feb 13 18:09:00 NOTICE[5150]: chan_sip.c:10824 handle_request_register: Registration from ‘jamaludin sip:8001@192.168.1.90’ failed for ‘192.168.1.56’ - Username/auth name mismatch

i already setting at extensions.conf

like this

[outgoing]

exten => _1NXXNXXXXXX,1,Dial(IAX2/8000:8000 @gwiaxt01.voicepulse.com/${EXTEN})

exten => _1NXXNXXXXXX,102,Dial(IAX2/8001:8001@gwiaxt02.voicepulse.com/${EXTEN})

if have other condiguration plase some budy tell me

Means that you have a wrong username/password set for one of your SIP configurations.

i already put a codeing at sip.conf in simple below … this codeing for my 3 soft phone
X-ten the extsions is 8000,8001,9000. so when i running this asterisk and trying to call …
have a error message :

Asterisk Ready.
*CLI> Feb 15 00:51:40 NOTICE[4496]: pbx.c:1693 pbx_extension_helper: Cannot find extension context 'from-sip’
Feb 15 00:55:32 NOTICE[4496]: pbx.c:1693 pbx_extension_helper: Cannot find extension context ‘from-sip’
[ sip.conf]

[general]
disallow=gsm
allow=ulaw
port = 5060 ; Port to bind to
bindaddr = 192.168.1.90 ; Address to bind to
context = from-sip ; Default for incoming calls

register = 8000:8000@192.168.1.90/8000
register = 8001:8001@192.168.1.90/8001
register = 9000:9000@192.168.1.90/9000

[8000]
type=friend
username=8000
secret=8000
host=dynamic
context=from-sip

[8001]
type=friend
username=8001
secret=8001
host=dynamic
context=from-sip

[9000]
type=friend
username=9000
secret=9000
host=dynamic
context=from-sip

i hope some budy help .me plase

i try using tree extensions for my system

Now it is a time to put in your extensions.conf context
from-sip
And in that context you must put extensions 8000,8001,9000